I'm finally getting close to having a greenhouse built. I've got various questions that I would really appreciate any input on from people that have real-world experience. Many of them have to do with my deep fears that the Oklahoma weather will be a disaster if i don't plan for major cooling. I'll probably get a passive gas heater (southern burner). The gh will be 8' x 16', cedar, with a tall peak. Any input or advice on the following would be greatly appreciated: 1. Motorized vs. passive intake vents: I’ve always thought that with a high peak and a decent exhaust fan I could get away with passive ones. I’m probably going to have limited electrical outlets although I could conceivable change that. Related to that…. 2. Number of electrical outlets: my site already has one coming out of the ground. My understanding is that you can add multiple boxes on one circuit but I’m a bit worried that one circuit won’t be enough. I anticipate an exhaust fan and a couple of oscillating fans and a pump or two for a wetwall and a misting system. Since the pumps would be intermittent, I wouldn’t think that electrical load would be too great. But then I’ll probably want/need lights. 3. Single vs. double door: originally I planned on two doors like a French door but for cost savings and since the overall size isn’t that great, I’m wondering if one door might be enough. 4. Solar roof vents: I’m assuming the ones with wax or oil in the cylinders are fairly standard and would plan to have at least two or maybe four to work with the intake vents to exhaust hot air from the top. Any thoughts on that? 5. Slab only vs. slab with gravel: I believe the contractors are planning on pouring a slab largely because the minimum concrete load is 3 cubic yards and they’ll have to pour footings. So they say they might as well use the extra for a slab. I assume that could get pretty slippery so I’m thinking pavers or gravel on top if needed. Also for humidity I wonder if the slab getting wetted down would be as good as gravel? 6. Exhaust fan vs. passive air flow via root vents and intake vents: with a high peak I wonder if I could get away with not using an exhaust fan? Since it routinely gets over 100 degrees here in summer, it worries me overall. But it does seem like the convection might be enough by itself. 7. Twin-wall panels vs. triple wall: I could save a lot of money by going with twin wall but I wonder if I would just be trading the cost of extra heating/cooling. Also I could kind of mix and match, i.e. put triple wall on the top and west and north, where extra insulation would be a benefit, but that would complicate things a lot. Related to that… 8. Panel attachment with screws or with H/U-channel fittings: the contractor wants to use the fittings but that will add a major cost factor and will get really complicated trying to determine the length and quantity of each type of fitting. I have a book on building greenhouses and it says to just screw the panels to the frame. I would think doing that with maybe some adhesive along the edges or weather stripping would be a lot cheaper, maybe stronger, and easier, and might actually look better. 9. Wet wall vs. aquafogger or other type of cooling: I definitely like the idea of the wet wall but it adds a lot of complications, including I would probably have to build it myself (the contractor has never built a gh and has no clue about a wet wall). I do think some kind of cooling will be an absolute must. I’ve read some forum posts where people really seem to like aquafoggers. Again, thanks to anyone that takes the time to respond. I know everyone is busy and these are a lot of questions. But this is the time for me to figure a lot of things out and avoid major problems in the future.